German-silver-alloy products and manufacture of same.



RASMUS-ZBECK, our nflnnn, GERMANY, ASSIGN'OR To run FIRM or UNITED STATES PATENT oFFIoE;

- I WERKE AKTIEN-GESELLSCHAFT, 0F Dil'REIN', GERMANY.

GERMAN-SILVER-ALLOY PRODUCTS AND MANUFACTURE OF SAME.

No Drawing.

To all whom it may 0mm: v

Be it 'known that I, RASMUS BECK, a

citizen of the. German Empire, residing at Diiren, Germany, have invented certain newand useful Improvements in German-Silver- Alloy Products and Manufacture of Same,

of which thefollowing is a specification.

This invention relates to rolled, drawn, extruded, stamped or forged products of German silver. For this purpose a German silver alloy, that is to say a zinc-coppernickel alloy, of. special composition is used which is distinguished from other German silver alloys by'its property of allowing working at red heat, and from such alloy the products are manufactured by. working the metal at red heat at least during a large part of the working processes.

. The alloy composition which is suited for the purpose is a composition comprising be-. sides 0 to 50% of zinc about 10% of nickel whereas the rest is formed entirely or mostly from copper.

It is not necessary to adhere strictly to the above named proportion of nickel. The increase or decrease in thenickel percentage shall, however, not be more than 5%, that is the alloy shall contain between 5% and. 15% nickel, this being a condition for obtaining alloys which are at the same time workable while hot and of silver-white color, especially if part'of the nickel is replaced by other compounds of same coloring action. By. going below the lower limit, the alloy'loses its silver-white color and be sides becomes brittle; by going. above the higher limit the alloy loses to a very great extent its red heat.

However, nickel may be replaced in small parts by other metals which, like nickel,

may be designated as white metals, such as cobalt, manganese, iron, aluminium, tin, magnesium and lead'according to the qualities required from the manufactured products, the total contents in copper, nickel, and such. other metals again amounting to 5060%.-

The economic importance of the invention resides in the cheapness of the metal used as well as in the cheapness of the work-- ing process. The cheapness of the metal results from the low percentage of nickel with a low percentage of copper, and the cheapness of the working process results property of being workable at- ,40.50 per cent: zinc, approximatelfy Spee'ificationof Letters Patent. Patented May 29, 191-7- Application filed Tune 27, 1914 Serial No. 847,694: I

from the working being done at red heat.

Moreover, the invention allows of producing obyects of German silver which can only be worked warm,

the extrusion process and stampin gs and forgings. Other products in German silver alloys, such as sheets, strips, wires, and

tubes which heretofore were only worked cold from alloys high in copper and nickel are cheapened on account of their being manufactured warm during a large part of the processes.

One of the characteristics of the new German silver alloy products is their high tensile strength; for instance annealed exv elastic limit, 70 kilogramsper square millimeter or 44.42 tons per square inch at the breaking stress limit with an elongation of The high tensile strength characteristics allow the use of the new alloy for such construction purposes for which a. high tensile strength is required.

What I claim is:.

1. The 'method of forming articles from a German silver alloy consisting of 4050% of zinc, 5,15%-of white metal in which nickel largely preponderates andthe residue of copper, which consists in heating the alloy to red heat and working it while hot into the desired shape.

2. The method of forming articles from a German silver alloy consisting of from 10 per cent. of nickel, and the residue 0 copper, which consists in. heating the alloy to about red heat and working itwhile hot into the desired shape. J

' 3. Rolled, drawn, extruded, stamped,

nt'mnnnn METALL- such as extruded shapes by forged, and similar products of German silver alloy containing 40-50 per cent. of j zinc, and 5 to 15 per cent. of other white coloring metals, the residue consisting main of cop'pe 4. I' tolled, drawn, extruded, stamped, forgei and similar products of German silver alloy containing 40-50 per cent. of zinc and 5 to 15 per cent. of other'white coloring metals in which nickel largely prcdomilifites. dominating among said White coloring 13 the residue consisting mainly of copper. Inctuls, the residue consisting mainly of 5. Rolled, drawn, extruded, stamped, copper. forged, and similar products of German sil- In testimony whereof I szfiix my signature, 1; Yer alloy containing 40-50 per cent. of zinc, in presence of two Witnesses.

-' and 5 to 15 per cent. of nickel and at least RASMUS BECK.

one of the following white coloring metals: Witnesses: cobalt, manganese, iron, aluminum, tin, mag- PAUL Dams,

masimu, and lead, the nickel largely pre- HENRY QUADFLIEG. 

